protected void handleZero(WritableRaster wr) {
// Get my source.
CachableRed src = (CachableRed) getSources().get(0);
Rectangle srcR = src.getBounds();
Rectangle wrR = wr.getBounds();
ZeroRecter zr = ZeroRecter.getZeroRecter(wr);
// area rect (covers the area left to handle).
Rectangle ar = new Rectangle(wrR.x, wrR.y, wrR.width, wrR.height);
// draw rect (used for calls to zeroRect);
Rectangle dr = new Rectangle(wrR.x, wrR.y, wrR.width, wrR.height);
// We split the edge drawing up into four parts.
//
// +-----------------------------+
// | 1 | 2 |
// | +---------------+------|
// / / /4 /
// / / / /
// / / / /
// / / / /
// | +---------------+------|
// | | 3 |
// +-----------------------------+
//
// We update our x,y, width, height as we go along so
// we 'forget' about the parts we have already painted...
// Draw #1
if (DEBUG) {
System.out.println("WrR: " + wrR + " srcR: " + srcR);
// g2d.setColor(new Color(255,0,0,128));
}
if (ar.x < srcR.x) {
int w = srcR.x - ar.x;
if (w > ar.width) w = ar.width;
// g2d.fillRect(x, y, w, height);
dr.width = w;
zr.zeroRect(dr);
ar.x += w;
ar.width -= w;
}
// Draw #2
if (DEBUG) {
System.out.println(
"WrR: [" + ar.x + "," + ar.y + "," + ar.width + "," + ar.height + "] s rcR: " + srcR);
// g2d.setColor(new Color(0,0,255,128));
}
if (ar.y < srcR.y) {
int h = srcR.y - ar.y;
if (h > ar.height) h = ar.height;
// g2d.fillRect(x, y, width, h);
dr.x = ar.x;
dr.y = ar.y;
dr.width = ar.width;
dr.height = h;
zr.zeroRect(dr);
ar.y += h;
ar.height -= h;
}
// Draw #3
if (DEBUG) {
System.out.println(
"WrR: [" + ar.x + "," + ar.y + "," + ar.width + "," + ar.height + "] srcR: " + srcR);
// g2d.setColor(new Color(0,255,0,128));
}
if (ar.y + ar.height > srcR.y + srcR.height) {
int h = (ar.y + ar.height) - (srcR.y + srcR.height);
if (h > ar.height) h = ar.height;
int y0 = ar.y + ar.height - h; // the +/-1 cancel (?)
// g2d.fillRect(x, y0, width, h);
dr.x = ar.x;
dr.y = y0;
dr.width = ar.width;
dr.height = h;
zr.zeroRect(dr);
ar.height -= h;
}
// Draw #4
if (DEBUG) {
System.out.println(
"WrR: [" + ar.x + "," + ar.y + "," + ar.width + "," + ar.height + "] srcR: " + srcR);
// g2d.setColor(new Color(255,255,0,128));
}
if (ar.x + ar.width > srcR.x + srcR.width) {
int w = (ar.x + ar.width) - (srcR.x + srcR.width);
if (w > ar.width) w = ar.width;
int x0 = ar.x + ar.width - w; // the +/-1 cancel (?)
// g2d.fillRect(x0, y, w, height);
dr.x = x0;
dr.y = ar.y;
dr.width = w;
dr.height = ar.height;
zr.zeroRect(dr);
ar.width -= w;
}
}
public static void zeroRect(WritableRaster wr) {
ZeroRecter zr = getZeroRecter(wr);
zr.zeroRect(wr.getBounds());
}